sparkfun DEV-14475 Hook-Up Manual page 5

Out of the box, the resistors are configured to take a headphone output signal from your computer or phone. When
cranked to 11, the output will be distorted, but that was done deliberately to make sure you're able to get the full
power from the amplifier. In stereo operation, both channels are effectively inverting amplifiers, which allows us to
use the following formula to calculate the gain: Av = -Rf / Ri, or Av = - Rpot / 2.2kΩ. In mono operation, one
amplifier is 180° out of phase, so the gain becomes Avd = Vout / (Vinl + Vinr) = 2 * (Rf/Ri), or Avd = Rpot / 2.2kΩ.
Output
The output of the Noisy Cricket can be configured as stereo or mono.
Stereo Operation
In stereo operation, the output has a maximum power output of 300mW/channel (with an 8Ω load). To connect
your stereo speakers you'll need to connect each speaker to the left and right output pins, as well as ground as
shown below.